leap_year_or_closest.c

#include <stdio.h>

int main() {
    int year, nearestLeap;

    printf("Enter a year: ");
    scanf("%d", &year);

    if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) {
        printf("%d is a leap year.\n", year);
    } else {
        // Find the nearest leap year
        if ((year + 1) % 4 == 0 && ((year + 1) % 100 != 0 || (year + 1) % 400 == 0)) {
            nearestLeap = year + 1;
        } else if ((year - 1) % 4 == 0 && ((year - 1) % 100 != 0 || (year - 1) % 400 == 0)) {
            nearestLeap = year - 1;
        } else if ((year + 2) % 4 == 0 && ((year + 2) % 100 != 0 || (year + 2) % 400 == 0)) {
            nearestLeap = year + 2;
        } else {
            nearestLeap = year - 2;
        }
        
        printf("%d is not a leap year. Nearest leap year is %d.\n", year, nearestLeap);
    }

    return 0;
}